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Full text of "MODE OF FORMING A SPIRAL FLUE FOR STEAM-BOILERS - United States Patent 675"

United States Patent Office.

BENJAMIN J. MILLER, OF NEW YORK, N. Y. MODE OF FORMING A SPIRAL 
FLUE FOR STEAM-BOILERS.

Specification forming part of Letters Patent No. 675, dated April 
5, 1838.

To all whom it may concern:

Be it known that I, Benjamin J. Miller, of the city and State of 
New York, have invented a new and useful Improvement in Flues for 
Steam-Boilers; and I do hereby declare that the following is an 
exact and full description.

The nature of my improvement consists in the application to 
ordinary low-pressure boilers flues of a spiral form, as 
hereinafter described, for the purpose of obtaining more 
compactness and strength than in the common method.

To enable others skilled in the art to make and use my invention, 
I will proceed to describe its construction and operation, 
reference being had to the drawing herewith deposited in the 
Patent Office.

A represents the exterior or shell of a steam-boiler and furnace 
of common construction, with an opening in one side, through 
which may be seen the spiral flue. The flue B is composed of a 
small cylinder or core a and a larger cylinder b, forming the 
exterior circumference of the flue, the cylinder being 
concentric. A spiral slot or opening, corresponding in each, 
extends from one end of the flue to the other, and the slot or 
opening thus made is preserved and the flue made complete by 
closing or joining the corresponding spiral edges of both 
cylinders, so that water may flow from the inside of the inner 
cylinder to the outside of the outer one, and the flame or heated 
air pass through the inclosed channel between the outside surface 
of the inner cylinder and the inside surface of the outer one 
until it reaches the chimney d. I make use of brace or socket 
bolts to give stability to such parts of the flue as may from its 
size or circumstances require support or strength.

What I claim as my invention, and desire to secure by Letters 
Patent, is�

The construction and application of one or more spiral flues to 
steam-boilers, as above substantially
described.

BENJAMIN J. MILLER.

Witnesses: WM. A. Cummings, Franklin W. Stillman.